Temporal Variation in Soil Resistance to Rill Erosion in Cropland of the Dry—Hot Valley Region, Southwest China

Yi Wang, Xiaosong Qin, Yaping Kong (), Dongdong Hou and Ping Ren
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Yi Wang: Key Laboratory of Ministry of Education on Land Resources Evaluation and Monitoring in Southwest China, Sichuan Normal University, Chengdu 610066, China
Xiaosong Qin: College of Geography and Resources Science, Sichuan Normal University, Chengdu 610101, China
Yaping Kong: China Academy of Transportation Sciences, Beijing 100029, China
Dongdong Hou: College of Geography and Resources Science, Sichuan Normal University, Chengdu 610101, China
Ping Ren: College of Geography and Resources Science, Sichuan Normal University, Chengdu 610101, China

Land, 2024, vol. 13, issue 4, 1-15

Abstract: In croplands, soil erosion resistance varies with both natural processes and human disturbances. To clarify the temporal variation in soil erosion resistance, nine cropland plots with three treatments (continuous fallow, fallow after tillage and tillage with corn) were established in the dry–hot valley region of China. A total of 144 field runoff simulation experiments were conducted from May to October to measure the soil detachment rate ( D c ), rill erodibility ( K r ) and critical shear stress ( τ c ). The results revealed that the natural dry—wet alternation had little influence on the continuous-fallowed soil erosion resistance. On the other hand, the tillage disturbance that occurred in May sharply increased the D c and K r to 2.24 and 3 times that of the continuous-fallow treatment, respectively. Then, the erosion resistance could be enhanced with surface consolidation for the fallow-after-tillage treatment. However, after three months of fallow, the K r was still 89.5% of the fresh tilled soil. In contrast, crop growth could significantly improve aggregate stability and reduce the K r to 38.2% in August and even further to 23.7% in October compared to the fresh tilled soil. It could be concluded that crop growth is more efficient in enhancing erosion resistance than the mechanical effect. The above results would benefit from the accurate modeling of cropland soil erosion dynamics and guide agricultural management in dry–hot climate regions.

Keywords: soil erosion resistance; rill erodibility; field experiment; cropland; dry–hot climate region (search for similar items in EconPapers)
JEL-codes: Q15 Q2 Q24 Q28 Q5 R14 R52 (search for similar items in EconPapers)
Date: 2024
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